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removing 24p jitter in FCP
Hi all
Is there a way to remove the jitter in 24p footage played on a NTSC monitor?
I have 24p footage taken of a P2 card and placed in a sequence with a time base os 23.98 timeline. This way I don’t have to render the clips out in the time line but the footage is jittery.
If I take the footage into a sequence with a timebase of 59.94 the jitter is gone but I have to render the clips. Which is not the fastest way to work. Do I have to convert all the clips to 60p? The final output will be NTSC SD but I want to work in HD incase we need to use it the future.
Many thanks
graeme
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7 Replies
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Ah… well, you see… NTSC is 30 fps. Straight up. No getting around it. You try to play a 23.98 sequence out of your Kona, or Blackmagic, or whatever, it’s going to add 3:2 pulldown on the fly to make those 30fps.
No way around it. Putting 24fps media in a 30fps timeline only results in duplicating frames which can give a staggering look when run in real-time. 3:2 was specifically engineered because it’s fairly invisible process to the human eye.
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So you are saying that I need to work in 24p and then do a conversion to NTSC 30fps in a program like after effects. If I do a converion in AE will I need to add 3:2 pull down. That stuff confusses the hell out of me.
Thanks
g
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I’ve never used P2 but on tape formats that jitter is common if you shot in 24P Advanced and are trying to view it at 30 fps. Since the pulldown cadaence on 24PA is 2:3:3:2 the movement looks uneven and jerky.
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Thanks Peter. So is there away around this? should we shoot it differently? I’m going from a blackmagic HD card into a standard Def NTSC broadcast monitor. If we used a HD monitor would we still see the jitter?
Thanks
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OK…I have a multiformat monitor…HD as well as SD. I work with DVCPRO HD footage at 23.98, and on an HD monitor, it looks fine. The signal being sent is a 59.94 signal, even though the footage is 23.98…TRUE 23.98 and 23.98 with pulldown removed mixed.
I also have an AJA KONA LH that I use to send the signal to the monitor, both HD SDI and a downconverted Component signal (so that I can ensure things look fine in SD land as well…I had issues with stills a couple shows back) THe signal being fed the SD is a 29.97 signal…and I don’t see strobing there. So…I don’t know what issues you are having.
How are you getting the signal from FCP to your SD monitors? I don’t recall seeing mention of a capture card.
Shane
Littlefrog Post
http://www.lfhd.net -
Correct me if I’m wrong but I thought the 24p native mode shot true 23.98 without pulldown
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24PN mode does record 24 real frames of video at 23.98…no pulldown required. Correct.
Shane
Littlefrog Post
http://www.lfhd.net
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